=√{10＋8√[3＋2√2]}
=√{10＋8√[√2＋1]²}
=√{10＋8(√2＋1)}
=√[18＋8√2]
=√[18＋2√32]
=√[√16＋√2]²
=√16＋√2
=4＋√2